# `mix affected.report`
[🔗](https://github.com/mnox/mix_affected/blob/v0.1.0/lib/mix/tasks/affected.report.ex#L1)

After a full `mix test`, compares ExUnit's failures manifest (the file
`mix test --failed` reads) with a selection saved by `mix affected.files
--format json`. Run with `MIX_ENV=test`.

    mix affected.report --selection selection.json [--format text|json] [--output path]

JSON: `schema_version`, `selection_full_run`, `failed_files`,
`missed_files` (failed files not in the selection; always `[]` for a
full-run selection), `selected_count`, `total_test_files`. Text: the missed
files, one per line.

Exit status 0 whatever the misses (shadow data); 1 on a usage error,
including an unreadable selection file. An unknown or missing failures
manifest reports `failed_files: []` and warns on stderr.

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*Consult [api-reference.md](api-reference.md) for complete listing*